If you're in the market for a portable battery pack/charger, the Godfather of them all just went on sale at Amazon: the ridiculously massive 16,000mAh i.Sound Power Max.

The Power Max has five full-size USB ports for powering/charging basically any device you can throw at it, be it an Android phone or tablet, iPad, Blackberry, or anything else with a maximum requirement of 2.4 Amps and can charge over USB. Another cool use is overnight-charging of multiple devices while only using one outlet.